Scratch Little Brute Original Design / Scratch Built
Scratch - Little Brute {Scratch}
Contributed by Matt Gillard
| Manufacturer: | Scratch |
Construction: T' whole rocket be painted pink t' match me original Big Brute, arrr, felt tip marker was used t' black out t' fins. Three strips o' black tape were added t' give t' strips. Ya scallywag! Blimey! T' name o' t' rocket, arrr, me bucko, Little Brute be printed on pink paper and then glued into place. Blimey! Avast! Blimey! I could nay brin' myself t' put t' original name in such a small rocket. After gluin' a new longer lug, two more flights were made a few days later on 1/4A3-3T motors. Each time t' flight was arrow straight with no deviation from t' flight path seen. On each recovery t' little brute buried itself in t' soft earth. Aye aye! spacecad version 3 does nay have t' 1/4AT motor profile. Avast! I imagine that version 4 does. Summary: Con: Ballistic recovery - never good.
Brief:
This is me first attempt o' a scale change. Ahoy! T' Big Brute is a rocket that I built a few years back but have never flown. Avast, me proud beauty! With t' 2008 challenge callin' for a scale change on a rocket, I thought I’d might as well get somethin' from t' original Big Brute. Ya scallywag! Lookin' through me collection o' nose cones, t' only one with t' same profile as t' Big Brute was a 13mm diameter nose cone, t' rest o' t' scalin' followed givin' a minimum diameter tumble recovery small brute.
Parts need
Also used was
T' scale from t' nose cone was t' be a 7.5 downscale which is about 13-14% o' t' original. This makes t' body tube t' be 2.2 inches long. Blimey! T' fins were down scaled from t' original usin' a photocopier t' make a template. See EMRR featured tips on how t' do this.
Apart from that t' rocket builds itself. My major concern that unlike all t' min diameter 13mm rockets that I have flown in t' past, arrr, this rocket does nay has much in t' way o' aft fins that lower t' CP t' somewhere safe. Arrr! Ya scallywag! T' 13mm motor really does lower t' CG, so I added 3g o' clay t' t' nose cone. Arrr! I used Spacecad t' check things out and it came back okay.
Flight:
First flight be on a 1/2A3-4T motor. Take off was very fast. Arrr! At about 100 feet it took a right angle turn and shot off sideways. On recovery, shiver me timbers, shiver me timbers, t' little brute was nose cone buried and had stripped its launch lug. Well, blow me down! Spacecad predicted 472 feet, this flight was nowhere near that.
Pro: It's small and I can get motors for it, me hearties, unlike t' big brute where I have t' get an explosive license and have t' police visit me house every year t' see a wooden box.
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